苹果幼树适宜密植的树形山东省果树研究所徐颖，张美勇一、小冠疏层形这种树形适用于株行距４～５米的中等密度果园。它的特点是：１．树冠小，于高４０～５０厘米，树高３．５米左右，冠径３～４米．树冠呈半圆形。２．骨干枝数量少，全树主枝５～６个，即一、二、三层主... Appropriate tree planting apple tree seedlings Shandong Institute of Pomology Xu Ying, Zhang Meiyong First, the sparse layer of small crown This tree is suitable for spacing 4 to 5 meters of medium-density orchards. Its features are: 1. Small crown, 40 to 50 cm high, tree height of 3.5 meters, 3 to 4 meters in diameter. Crown was semicircular. 2. The backbone of a small number of branches, the whole tree main branch 5 to 6, that is, one, two, three main ...